Make perf map symbolization test an end-to-end test

[d-e-s-o]

Make the perf map symbolization test an end-to-end test and move it into the corresponding test suite. Instead of exposing our PerfMap logic, implement a ghetto perf map line parsing logic in five or so lines inside the test itself.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 94.50%. Comparing base (d2f3cb6) to head (16203ee). Report is 2 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #894 +/- ## ========================================== - Coverage 94.54% 94.50% -0.04% ========================================== Files 56 56 Lines 10204 10140 -64 ========================================== - Hits 9647 9583 -64 Misses 557 557 ```

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